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Usually, the gasoline tank of the plane is configured symmetrically inside wing. Such designs have a few profit: 1. Gasoline tank does not take airframe dimension, the guest freight that is helpful for raising a plane loses ability; 2. In the process of specific fuel consumption, volume of shift of plane centre of gravity place is minor, the benefit flight balance at the plane and safety; 3. Because the weight of oil plants and plane lift way are opposite, conduce to those who reduce wing construction getting power; 4. The oily spacing region of park wing is more remote, force to land in the plane etc safety is compared below special situation.

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